EP0203636B1 - Farbbildröhre mit sauberer Bildschirmabgrenzung - Google Patents

Farbbildröhre mit sauberer Bildschirmabgrenzung Download PDF

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Publication number
EP0203636B1
EP0203636B1 EP86200714A EP86200714A EP0203636B1 EP 0203636 B1 EP0203636 B1 EP 0203636B1 EP 86200714 A EP86200714 A EP 86200714A EP 86200714 A EP86200714 A EP 86200714A EP 0203636 B1 EP0203636 B1 EP 0203636B1
Authority
EP
European Patent Office
Prior art keywords
slots
length
crt
array
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86200714A
Other languages
English (en)
French (fr)
Other versions
EP0203636A2 (de
EP0203636A3 (en
Inventor
John Dewitt Robbins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips North America LLC
Original Assignee
North American Philips Consumer Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North American Philips Consumer Electronics Corp filed Critical North American Philips Consumer Electronics Corp
Publication of EP0203636A2 publication Critical patent/EP0203636A2/de
Publication of EP0203636A3 publication Critical patent/EP0203636A3/en
Application granted granted Critical
Publication of EP0203636B1 publication Critical patent/EP0203636B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/076—Shadow masks for colour television tubes characterised by the shape or distribution of beam-passing apertures

Definitions

  • This invention relates to colour cathode ray tubes (CRTs) having vertically striped phosphor screens and slotted aperture masks, and more particularly relates to such CRTs having smooth top and bottom screen edges.
  • CRTs colour cathode ray tubes
  • Colour CRTs for colour television produce an image display on a cathodoluminescent screen composed of a repetitive array of red, blue and green phosphor elements, by scanning the array with three electron beams from an electron gun in the neck of the CRT, one beam for each of the primary (red, blue and green) colours.
  • the beams emanate from separate gun apertures, converge as they approach the screen, pass through an aperture mask positioned a short distance (designated "Q") behind the screen, and then diverge slightly to land on the appropriate phosphor stripe.
  • Q short distance
  • the human eye cannot resolve the individual red, blue and green elements in the screen, but rather integrates these primary colours to perceive additive colours produced by the primary colours.
  • the masks for these striped screens are composed of vertically oriented columns of slot-shaped apertures separated from one another by so-called “tie bars” of mask material, which "tie” the mask together to provide needed mechanical strength.
  • the slots in adjacent columns are usually staggered in some manner in order to avoid moire, an annoying beat pattern on the screen caused by slight, unintentional misregistration between the mask, screen and raster scan patterns.
  • a colour CRT having a cathodoluminescent screen comprising an array of vertical phosphor stripes and an aperture mask positioned in spaced relationship to the screen, the mask comprising an array of slot shaped apertures arranged in vertical columns corresponding to the vertical phosphor stripes, the distance from the center of one slot to the center of a vertically adjacent slot being designated as vertical pitch, the slots in adjacent columns being vertically displaced from one another, slots in non-adjacent columns lying in substantially horizontal rows, and diagonally adjacent slots lying in adjacent rows, the array being defined by top, bottom, left and right edges, and at least the top and bottom edges being curved, characterized in that every other column terminates in full length slots, and adjacent columns terminate in partial length slots, and the vertical pitch varies uniformly to maintain the same number of slots in every other column, thereby to provide relatively smooth edges.
  • the columns which terminate in partial length slots extend beyond the adjacent columns by an amount less than one-half of a full length slot.
  • This embodiment may be advantageous in that the mask is often used as a photomask in the photolithographic production of the CRT screen, and in that larger partial apertures are sometimes required to produce the phosphor stripes ending at the defined screen edge.
  • the slot length and/or the thickness of the bridges between adjacent slots may be varied to achieve the same number of slots in every other column.
  • colour CRT 10 is composed of evacuated glass envelope 11, electron guns 12, 13 and 14, which direct electron beams 15,16 and 17 toward screen 18, composed of alternating red, blue and green phosphor stripes, three of which, 19, 20 and 21, are shown.
  • the beams 15, 16 and 17 converge as they approach aperture mask 22, then pass through vertical aperture column 23 and diverge slightly to land on the appropriate phosphor stripe 19, 20 or 21. Additional columns of apertures similarly correspond to additional stripe triplets, not shown.
  • External deflection coils and associated circuitry cause the beams to scan the mask and screen in a known manner, to produce a rectangular raster pattern on the screen.
  • Mask 22 and screen 23 are divided into quadrants by horizontal (X) and vertical (Y) axes, sometimes referred to as the major and minor axes. Because the quadrants are symmetrical with respect to these axes, it is conventional practice to specify a mask design by referring to only one of these quadrants. Accordingly, Figure 2 shows the upper right hand (as viewed from the rear view of Figure 1) quadrant of mask 22, in which top edges 120 of the aperture array has a slight convex curvature, indicating symmetrical curvatures in the remaining quadrants. The number of aperture columns is indicated on the X axis as 0 to n, and the height of these columns is indicated as Y(0) to Y(n).
  • the distance between the center of an aperture 121 to the center of a vertically adjacent aperture 122 is designated as vertical pitch "p".
  • the mask material separating these apertures is referred to as tie bar 124.
  • Light hand edge 123, defined by column “n”, generally has a slight concavity in order to result in a substantially straight screen edge.
  • the vertical pitch between apertures is generally held constant across the entire mask (except for slight variations caused by forming the flat mask into the desired contour).
  • the curvature of the top and bottom edges of the aperture array causes these edges to intersect the apertures and tie bars in a more or less random manner, resulting in a ragged appearance to the screen edge.
  • This ragged appearance is aggravated by the further practice of staggering apertures in adjacent columns to avoid moire on the screen.
  • Such staggering is generally achieved simply by vertically displacing the slots in every other column by the distance of one half "p".
  • this ragged appearance is substantially avoided by causing the vertical pitch "p" to vary from column to column so that at least every other column and perhaps each column has the same number of slots and the unstaggered columns all terminate in full length slots.
  • This can be achieved, for example, by choosing a suitable number (integer m) of vertical pitches for the entire mask array and calculating the vertical pitch for each column by dividing the appropriate column height in the quadrant by m/ 2, the number of vertical pitches in the quadrant.
  • the first column (designated “0") has its first slot in the quadrant centered at the origin (intersection of the X and Y axes) and its last slot is a full length slot terminating at edge 120.
  • the second column (designated 1) has its first slot in the quadrant centered a distance of one-half "p" above the X axis and a smaller vertical pitch so that its last slot terminates at edge 120 as a partial length slot of length given by the following expression:
  • one-half "p" is equal to one-half a slot length plus one-half a tie bar length
  • the partial slot length is less than half a slot length by a half a tie bar length.
  • the vertical pitch is then decreased for each succeeding column numbered "2" through “n", so that all even numbered columns terminate in full length slots and all odd numbered column terminate in partial length slots.
  • the vertical pitch for column "0" is 0.7145 millimeters.
  • the quadrant height for column number 250 is 188.82 millimeters, and the vertical pitch is 0.7112 millimeters.
  • the top and bottom edges of the mask array have a radius of curvature of from about 3,000 to 20,000 millimeters, versus 1,000 to 5,000 millimeters for prior designs.
  • Such full square designs typically have from about 190 to 350 vertical pitches per quadrant column, and the vertical pitch varies from about 115 to 135 percent of the slot length at the Y axis to about 110 to 130 percent of the slot length at the left and right edges of the array.
  • the same basic method can be used whether the number of pitches in a full column is odd or even, and whether a slot or a tie bar is located at the origin, and whether the odd or even numbered columns end in a full or partial length slot.
  • the aperture mask is used as a photomask.
  • partial length slots at column ends sometimes result in less than optimum dosages (intensity times time) of actinic radiation to the photoresist, and consequently, shorter than desired phosphor stripes on the screen.
  • the partial slots are extended slightly beyond the edge of the aperture array in order to result in smoother screen edges produced photolithographically.
  • Figure 3 is a computer plot (exaggerated) of an array in which the slot length and the number of pitches is kept constant, and in which partial slots 34 in odd numbered columns extend beyond the full length slots 33 in even numbered columns by a constant amount AY across the edge of the array 32 to form a secondary edge 31.
  • This embodiment is particularly advantageous when the partial slots would otherwise be very short (100-150% of slot width).
  • very short slots tend to be difficult to produce by the conventional photoetching process used to form the masks.
  • smooth screen edges may be obtained by the conventional black matrix photolithographic process using the aperture mask as a photomask, where the terminal partial length slots are from about 50 to 80 percent of the length of the full length slots.
  • the thickness of the bridges is varied or both the slot length and the thickness of the bridges are varied to maintain the same number of slots in every other column.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (9)

1. Farbbildröhre mit einem Kathodolumineszenzschirm mit einem Gebiet vertikaler Leuchtstoffstreifen und einer Lochmaske im Abstand vom Schirm, wobei die Maske ein Gebiet mit schlitzförmigen Öffnungen in vertikalen Spalten entsprechend den vertikalen Leuchtstoffstreifen enthält, wobei der Abstand von der Mitte eines Schlitzes zur Mitte eines benachbarten vertikalen Schlitzes mit vertikaler Teilung bezeichnet wird, die Schlitze in benachbarten Spalten in vertikaler Richtung gegeneinander versetzt sind, die Schlitze in nicht benachbarten Spalten im wesentlichen in horizontalen Reihen und diagonalweise benachbarte Schlitze in benachbarten Reihen liegen, das Gebiet durch obere, untere, linke und rechte Kanten festgelegt ist und wenigstens die oberen und unteren Kanten gekrümmt sind, dadurch gekennzeichnet, daß jede zweite Spalte in Schlitzen mit voller Länge endet, benachbarte Spalten in Schlitzen mit Teillängen enden, und sich die vertikale Teilung einheitlich ändert, um die gleiche Anzahl von Schlitzen in jeder zweiten Spalte zu erhalten, zum erzeugen verhältnismäßig gleichmäßig verlaufende Kanten.
2. Farbbildröhre nach Anspruch 1, dadurch gekennzeichnet, daß die in Schlitzen mit Teillängen endenden Spalten sich an den benachbarten Spalten um einen Betrag weniger als die Hälfte einer vollen Schlitzlänge vorbei erstrecken.
3. Farbbildröhre nach Anspruch 2, dadurch gekennzeichnet, daß die Länge der Teillängenschlitze zwischen etwa 50 bis 80% der Schlitze mit voller Länge beträgt.
4. Farbbildröhre nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß das Gebiet durch eine X-Achse in horizontaler Richtung und durch eine Y-Achse in vertikaler Richtung zweigeteilt ist, und daß die oberen und unteren Kanten des Maskengebiets in bezug auf die X-Achse konvex und symmetrisch gekrümmt sind.
5. Farbbildröhre nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die oberen und unteren Kanten des Maskengebiets einen Krümmungsradius von etwa 3.000 bis 20.000 mm besitzen.
6. Farbbildröhre nach einem der Anspruch 1 bis 5, dadurch gekennzeichnet, daß die Länge der Schlitze mit voller Länge im wesentlichen konstant ist.
7. Farbbildröhre nach Anspruch 6, dadurch gekennzeichnet, daß jede Quadrantspalte etwa 190 bis 350 vertikale Teilungen enthält, und die vertikale Teilung von etwa 115 bis 135% der Schlitzlänge auf der Y-Achse und von etwa 110 bis 130% der Schlitzlänge an den linken und rechten Kanten des Gebiets variiert.
8. Farbbildröhre nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Breite der Stege im wesentlichen konstant ist und zum Aufrechterhalten der gleichen Anzahl von Schlitzen in jeder zweiten Spalte die Schlitzlänge variiert wird.
9. Farbbildröhre nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Breite der Stege und die Schlitzlänge zum Aufrechterhalten der gleichen Anzahl von Schlitzen in jeder zweiten Spalte variiert wird.
EP86200714A 1985-04-29 1986-04-25 Farbbildröhre mit sauberer Bildschirmabgrenzung Expired EP0203636B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US728368 1985-04-29
US06/728,368 US4631440A (en) 1985-04-29 1985-04-29 Color cathode ray tube having smooth screen edges

Publications (3)

Publication Number Publication Date
EP0203636A2 EP0203636A2 (de) 1986-12-03
EP0203636A3 EP0203636A3 (en) 1987-11-11
EP0203636B1 true EP0203636B1 (de) 1989-10-25

Family

ID=24926579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86200714A Expired EP0203636B1 (de) 1985-04-29 1986-04-25 Farbbildröhre mit sauberer Bildschirmabgrenzung

Country Status (8)

Country Link
US (1) US4631440A (de)
EP (1) EP0203636B1 (de)
JP (1) JPS61250929A (de)
KR (1) KR950001138B1 (de)
CA (1) CA1261386A (de)
DD (1) DD244875A5 (de)
DE (1) DE3666642D1 (de)
ES (1) ES8707376A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5030881A (en) * 1990-07-02 1991-07-09 Rca Licensing Corporation Color picture tube with shadow mask having improved aperture border
US5243253A (en) * 1991-07-30 1993-09-07 Thomson Consumer Electronics, Inc. Color picture tube having shadow mask with improved tie bar grading
US5583391A (en) * 1995-11-15 1996-12-10 Thomson Consumer Electronics, Inc. Color picture tube shadow mask having improved mask aperture pattern
KR100389540B1 (ko) * 2001-01-31 2003-06-27 주식회사 엘지이아이 개선된 슬롯형상의 새도우마스크를 가지는 칼라 음극선관
KR100778398B1 (ko) * 2001-05-08 2007-11-21 삼성에스디아이 주식회사 플랫 마스크와 이 마스크의 조립 방법 및 이 방법에 의해제조된 텐션 마스크 조립체

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5129635B2 (de) * 1971-09-21 1976-08-26
US3766419A (en) * 1972-11-10 1973-10-16 Rca Corp Cathode-ray tube with shadow mask having random web distribution
NL7302367A (de) * 1973-02-21 1974-08-23
JPS5224073A (en) * 1975-07-15 1977-02-23 Nec Corp Color braun tube use shadow mask plate
JPS5826140B2 (ja) * 1977-06-09 1983-06-01 三菱電機株式会社 カラ−受像管のシャドウマスク
NL7711713A (nl) * 1977-10-26 1979-05-01 Philips Nv Kleurenbeeldbuis.
DE2841286A1 (de) * 1978-09-22 1980-04-10 Licentia Gmbh Farbbildkathodenstrahlroehre mit rechteckfoermigem leuchtschirm
US4300070A (en) * 1978-11-30 1981-11-10 Rca Corporation Cathode-ray tube screen border improvement
JPS5948507B2 (ja) * 1980-03-11 1984-11-27 三菱電機株式会社 スロツト形シヤドウマスク
JPS5840745A (ja) * 1981-09-02 1983-03-09 Sony Corp カラ−陰極線管
JPS6119029A (ja) * 1984-07-06 1986-01-27 Toshiba Corp カラ−受像管

Also Published As

Publication number Publication date
KR860008587A (ko) 1986-11-17
KR950001138B1 (ko) 1995-02-11
CA1261386A (en) 1989-09-26
US4631440A (en) 1986-12-23
DE3666642D1 (en) 1989-11-30
EP0203636A2 (de) 1986-12-03
ES554366A0 (es) 1987-07-16
DD244875A5 (de) 1987-04-15
EP0203636A3 (en) 1987-11-11
ES8707376A1 (es) 1987-07-16
JPS61250929A (ja) 1986-11-08

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